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<head>
  <meta charset="UTF-8">
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  <title>Document</title>
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<body>
  <script>
     const arr=[{
       name:'张三',
       salary:1000
     },{
       name:'李四',
       salary:1000
     },{
       name:'王五',
       salary:1000
     }]
     const ret=arr.reduce((sum,item)=>sum+item.salary*0.3,0)
     console.log(ret);
     
  </script>
</body>
</html>